/*
 * imgAreaSelect jQuery plugin
 * version 0.9.10
 *
 * Copyright (c) 2008-2013 Michal Wojciechowski (odyniec.net)
 *
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://odyniec.net/projects/imgareaselect/
 *
 */

(function ($) {

    /*
     * Math functions will be used extensively, so it's convenient to make a few
     * shortcuts
     */
    var abs = Math.abs,
        max = Math.max,
        min = Math.min,
        round = Math.round;

    /**
     * Create a new HTML div element
     *
     * @return A jQuery object representing the new element
     */
    function div() {
        return $('<div/>');
    }

    /**
     * imgAreaSelect initialization
     *
     * @param img
     *            A HTML image element to attach the plugin to
     * @param options
     *            An options object
     */
    $.imgAreaSelect = function (img, options) {
        var
        /* jQuery object representing the image */
            $img = $(img),

        /* Has the image finished loading? */
            imgLoaded,

        /* Plugin elements */

        /* Container box */
            $box = div(),
        /* Selection area */
            $area = div(),
        /* Border (four divs) */
            $border = div().add(div()).add(div()).add(div()),
        /* Outer area (four divs) */
            $outer = div().add(div()).add(div()).add(div()),
        /* Handles (empty by default, initialized in setOptions()) */
            $handles = $([]),

        /*
         * Additional element to work around a cursor problem in Opera
         * (explained later)
         */
            $areaOpera,

        /* Image position (relative to viewport) */
            left, top,

        /* Image offset (as returned by .offset()) */
            imgOfs = { left: 0, top: 0 },

        /* Image dimensions (as returned by .width() and .height()) */
            imgWidth, imgHeight,

        /*
         * jQuery object representing the parent element that the plugin
         * elements are appended to
         */
            $parent,

        /* Parent element offset (as returned by .offset()) */
            parOfs = { left: 0, top: 0 },

        /* Base z-index for plugin elements */
            zIndex = 0,

        /* Plugin elements position */
            position = 'absolute',

        /* X/Y coordinates of the starting point for move/resize operations */
            startX, startY,

        /* Horizontal and vertical scaling factors */
            scaleX, scaleY,

        /* Current resize mode ("nw", "se", etc.) */
            resize,

        /* Selection area constraints */
            minWidth, minHeight, maxWidth, maxHeight,

        /* Aspect ratio to maintain (floating point number) */
            aspectRatio,

        /* Are the plugin elements currently displayed? */
            shown,

        /* Current selection (relative to parent element) */
            x1, y1, x2, y2,

        /* Current selection (relative to scaled image) */
            selection = { x1: 0, y1: 0, x2: 0, y2: 0, width: 0, height: 0 },

        /* Document element */
            docElem = document.documentElement,

        /* User agent */
            ua = navigator.userAgent,

        /* Various helper variables used throughout the code */
            $p, d, i, o, w, h, adjusted;

        /*
         * Translate selection coordinates (relative to scaled image) to viewport
         * coordinates (relative to parent element)
         */

        /**
         * Translate selection X to viewport X
         *
         * @param x
         *            Selection X
         * @return Viewport X
         */
        function viewX(x) {
            return x + imgOfs.left - parOfs.left;
        }

        /**
         * Translate selection Y to viewport Y
         *
         * @param y
         *            Selection Y
         * @return Viewport Y
         */
        function viewY(y) {
            return y + imgOfs.top - parOfs.top;
        }

        /*
         * Translate viewport coordinates to selection coordinates
         */

        /**
         * Translate viewport X to selection X
         *
         * @param x
         *            Viewport X
         * @return Selection X
         */
        function selX(x) {
            return x - imgOfs.left + parOfs.left;
        }

        /**
         * Translate viewport Y to selection Y
         *
         * @param y
         *            Viewport Y
         * @return Selection Y
         */
        function selY(y) {
            return y - imgOfs.top + parOfs.top;
        }

        /*
         * Translate event coordinates (relative to document) to viewport
         * coordinates
         */

        /**
         * Get event X and translate it to viewport X
         *
         * @param event
         *            The event object
         * @return Viewport X
         */
        function evX(event) {
            return event.pageX - parOfs.left;
        }

        /**
         * Get event Y and translate it to viewport Y
         *
         * @param event
         *            The event object
         * @return Viewport Y
         */
        function evY(event) {
            return event.pageY - parOfs.top;
        }

        /**
         * Get the current selection
         *
         * @param noScale
         *            If set to <code>true</code>, scaling is not applied to the
         *            returned selection
         * @return Selection object
         */
        function getSelection(noScale) {
            var sx = noScale || scaleX, sy = noScale || scaleY;

            return { x1: round(selection.x1 * sx),
                y1: round(selection.y1 * sy),
                x2: round(selection.x2 * sx),
                y2: round(selection.y2 * sy),
                width: round(selection.x2 * sx) - round(selection.x1 * sx),
                height: round(selection.y2 * sy) - round(selection.y1 * sy) };
        }

        /**
         * Set the current selection
         *
         * @param x1
         *            X coordinate of the upper left corner of the selection area
         * @param y1
         *            Y coordinate of the upper left corner of the selection area
         * @param x2
         *            X coordinate of the lower right corner of the selection area
         * @param y2
         *            Y coordinate of the lower right corner of the selection area
         * @param noScale
         *            If set to <code>true</code>, scaling is not applied to the
         *            new selection
         */
        function setSelection(x1, y1, x2, y2, noScale) {
            var sx = noScale || scaleX, sy = noScale || scaleY;

            selection = {
                x1: round(x1 / sx || 0),
                y1: round(y1 / sy || 0),
                x2: round(x2 / sx || 0),
                y2: round(y2 / sy || 0)
            };

            selection.width = selection.x2 - selection.x1;
            selection.height = selection.y2 - selection.y1;
        }

        /**
         * Recalculate image and parent offsets
         */
        function adjust() {
            /*
             * Do not adjust if image has not yet loaded or if width is not a
             * positive number. The latter might happen when imgAreaSelect is put
             * on a parent element which is then hidden.
             */
            if (!imgLoaded || !$img.width())
                return;

            /*
             * Get image offset. The .offset() method returns float values, so they
             * need to be rounded.
             */
            imgOfs = { left: round($img.offset().left), top: round($img.offset().top) };

            /* Get image dimensions */
            imgWidth = $img.innerWidth();
            imgHeight = $img.innerHeight();

            imgOfs.top += ($img.outerHeight() - imgHeight) >> 1;
            imgOfs.left += ($img.outerWidth() - imgWidth) >> 1;

            /* Set minimum and maximum selection area dimensions */
            minWidth = round(options.minWidth / scaleX) || 0;
            minHeight = round(options.minHeight / scaleY) || 0;
            maxWidth = round(min(options.maxWidth / scaleX || 1 << 24, imgWidth));
            maxHeight = round(min(options.maxHeight / scaleY || 1 << 24, imgHeight));

            /*
             * Workaround for jQuery 1.3.2 incorrect offset calculation, originally
             * observed in Safari 3. Firefox 2 is also affected.
             */
            if ($().jquery == '1.3.2' && position == 'fixed' && !docElem['getBoundingClientRect']) {
                imgOfs.top += max(document.body.scrollTop, docElem.scrollTop);
                imgOfs.left += max(document.body.scrollLeft, docElem.scrollLeft);
            }

            /* Determine parent element offset */
            parOfs = /absolute|relative/.test($parent.css('position')) ?
            { left: round($parent.offset().left) - $parent.scrollLeft(),
                top: round($parent.offset().top) - $parent.scrollTop() } :
                    position == 'fixed' ?
            { left: $(document).scrollLeft(), top: $(document).scrollTop() } :
            { left: 0, top: 0 };

            left = viewX(0);
            top = viewY(0);

            /*
             * Check if selection area is within image boundaries, adjust if
             * necessary
             */
            if (selection.x2 > imgWidth || selection.y2 > imgHeight)
                doResize();
        }

        /**
         * Update plugin elements
         *
         * @param resetKeyPress
         *            If set to <code>false</code>, this instance's keypress
         *            event handler is not activated
         */
        function update(resetKeyPress) {
            /* If plugin elements are hidden, do nothing */
            if (!shown) return;

            /*
             * Set the position and size of the container box and the selection area
             * inside it
             */
            $box.css({ left: viewX(selection.x1), top: viewY(selection.y1) })
                .add($area).width(w = selection.width).height(h = selection.height);

            /*
             * Reset the position of selection area, borders, and handles (IE6/IE7
             * position them incorrectly if we don't do this)
             */
            $area.add($border).add($handles).css({ left: 0, top: 0 });

            /* Set border dimensions */
            $border
                .width(max(w - $border.outerWidth() + $border.innerWidth(), 0))
                .height(max(h - $border.outerHeight() + $border.innerHeight(), 0));

            /* Arrange the outer area elements */
            $($outer[0]).css({ left: left, top: top,
                width: selection.x1, height: imgHeight });
            $($outer[1]).css({ left: left + selection.x1, top: top,
                width: w, height: selection.y1 });
            $($outer[2]).css({ left: left + selection.x2, top: top,
                width: imgWidth - selection.x2, height: imgHeight });
            $($outer[3]).css({ left: left + selection.x1, top: top + selection.y2,
                width: w, height: imgHeight - selection.y2 });

            w -= $handles.outerWidth();
            h -= $handles.outerHeight();

            /* Arrange handles */
            switch ($handles.length) {
                case 8:
                    $($handles[4]).css({ left: w >> 1 });
                    $($handles[5]).css({ left: w, top: h >> 1 });
                    $($handles[6]).css({ left: w >> 1, top: h });
                    $($handles[7]).css({ top: h >> 1 });
                case 4:
                    $handles.slice(1, 3).css({ left: w });
                    $handles.slice(2, 4).css({ top: h });
            }

            if (resetKeyPress !== false) {
                /*
                 * Need to reset the document keypress event handler -- unbind the
                 * current handler
                 */
                if ($.imgAreaSelect.onKeyPress != docKeyPress)
                    $(document).unbind($.imgAreaSelect.keyPress,
                        $.imgAreaSelect.onKeyPress);

                if (options.keys)
                /*
                 * Set the document keypress event handler to this instance's
                 * docKeyPress() function
                 */
                    $(document)[$.imgAreaSelect.keyPress](
                        $.imgAreaSelect.onKeyPress = docKeyPress);
            }

            /*
             * Internet Explorer displays 1px-wide dashed borders incorrectly by
             * filling the spaces between dashes with white. Toggling the margin
             * property between 0 and "auto" fixes this in IE6 and IE7 (IE8 is still
             * broken). This workaround is not perfect, as it requires setTimeout()
             * and thus causes the border to flicker a bit, but I haven't found a
             * better solution.
             *
             * Note: This only happens with CSS borders, set with the borderWidth,
             * borderOpacity, borderColor1, and borderColor2 options (which are now
             * deprecated). Borders created with GIF background images are fine.
             */
            if (msie && $border.outerWidth() - $border.innerWidth() == 2) {
                $border.css('margin', 0);
                setTimeout(function () {
                    $border.css('margin', 'auto');
                }, 0);
            }
        }

        /**
         * Do the complete update sequence: recalculate offsets, update the
         * elements, and set the correct values of x1, y1, x2, and y2.
         *
         * @param resetKeyPress
         *            If set to <code>false</code>, this instance's keypress
         *            event handler is not activated
         */
        function doUpdate(resetKeyPress) {
            adjust();
            update(resetKeyPress);
            x1 = viewX(selection.x1);
            y1 = viewY(selection.y1);
            x2 = viewX(selection.x2);
            y2 = viewY(selection.y2);
        }

        /**
         * Hide or fade out an element (or multiple elements)
         *
         * @param $elem
         *            A jQuery object containing the element(s) to hide/fade out
         * @param fn
         *            Callback function to be called when fadeOut() completes
         */
        function hide($elem, fn) {
            options.fadeSpeed ? $elem.fadeOut(options.fadeSpeed, fn) : $elem.hide();
        }

        /**
         * Selection area mousemove event handler
         *
         * @param event
         *            The event object
         */
        function areaMouseMove(event) {
            var x = selX(evX(event)) - selection.x1,
                y = selY(evY(event)) - selection.y1;

            if (!adjusted) {
                adjust();
                adjusted = true;

                $box.one('mouseout', function () {
                    adjusted = false;
                });
            }

            /* Clear the resize mode */
            resize = '';

            if (options.resizable) {
                /*
                 * Check if the mouse pointer is over the resize margin area and set
                 * the resize mode accordingly
                 */
                if (y <= options.resizeMargin)
                    resize = 'n';
                else if (y >= selection.height - options.resizeMargin)
                    resize = 's';
                if (x <= options.resizeMargin)
                    resize += 'w';
                else if (x >= selection.width - options.resizeMargin)
                    resize += 'e';
            }

            $box.css('cursor', resize ? resize + '-resize' :
                options.movable ? 'move' : '');
            if ($areaOpera)
                $areaOpera.toggle();
        }

        /**
         * Document mouseup event handler
         *
         * @param event
         *            The event object
         */
        function docMouseUp(event) {
            /* Set back the default cursor */
            $('body').css('cursor', '');
            /*
             * If autoHide is enabled, or if the selection has zero width/height,
             * hide the selection and the outer area
             */
            if (options.autoHide || selection.width * selection.height == 0)
                hide($box.add($outer), function () {
                    $(this).hide();
                });

            $(document).unbind('mousemove', selectingMouseMove);
            $box.mousemove(areaMouseMove);

            options.onSelectEnd(img, getSelection());
        }

        /**
         * Selection area mousedown event handler
         *
         * @param event
         *            The event object
         * @return false
         */
        function areaMouseDown(event) {
            if (event.which != 1) return false;

            adjust();

            if (resize) {
                /* Resize mode is in effect */
                $('body').css('cursor', resize + '-resize');

                x1 = viewX(selection[/w/.test(resize) ? 'x2' : 'x1']);
                y1 = viewY(selection[/n/.test(resize) ? 'y2' : 'y1']);

                $(document).mousemove(selectingMouseMove)
                    .one('mouseup', docMouseUp);
                $box.unbind('mousemove', areaMouseMove);
            }
            else if (options.movable) {
                startX = left + selection.x1 - evX(event);
                startY = top + selection.y1 - evY(event);

                $box.unbind('mousemove', areaMouseMove);

                $(document).mousemove(movingMouseMove)
                    .one('mouseup', function () {
                        options.onSelectEnd(img, getSelection());

                        $(document).unbind('mousemove', movingMouseMove);
                        $box.mousemove(areaMouseMove);
                    });
            }
            else
                $img.mousedown(event);

            return false;
        }

        /**
         * Adjust the x2/y2 coordinates to maintain aspect ratio (if defined)
         *
         * @param xFirst
         *            If set to <code>true</code>, calculate x2 first. Otherwise,
         *            calculate y2 first.
         */
        function fixAspectRatio(xFirst) {
            if (aspectRatio)
                if (xFirst) {
                    x2 = max(left, min(left + imgWidth,
                            x1 + abs(y2 - y1) * aspectRatio * (x2 > x1 || -1)));
                    y2 = round(max(top, min(top + imgHeight,
                            y1 + abs(x2 - x1) / aspectRatio * (y2 > y1 || -1))));
                    x2 = round(x2);
                }
                else {
                    y2 = max(top, min(top + imgHeight,
                            y1 + abs(x2 - x1) / aspectRatio * (y2 > y1 || -1)));
                    x2 = round(max(left, min(left + imgWidth,
                            x1 + abs(y2 - y1) * aspectRatio * (x2 > x1 || -1))));
                    y2 = round(y2);
                }
        }

        /**
         * Resize the selection area respecting the minimum/maximum dimensions and
         * aspect ratio
         */
        function doResize() {
            /*
             * Make sure the top left corner of the selection area stays within
             * image boundaries (it might not if the image source was dynamically
             * changed).
             */
            x1 = min(x1, left + imgWidth);
            y1 = min(y1, top + imgHeight);

            if (abs(x2 - x1) < minWidth) {
                /* Selection width is smaller than minWidth */
                x2 = x1 - minWidth * (x2 < x1 || -1);

                if (x2 < left)
                    x1 = left + minWidth;
                else if (x2 > left + imgWidth)
                    x1 = left + imgWidth - minWidth;
            }

            if (abs(y2 - y1) < minHeight) {
                /* Selection height is smaller than minHeight */
                y2 = y1 - minHeight * (y2 < y1 || -1);

                if (y2 < top)
                    y1 = top + minHeight;
                else if (y2 > top + imgHeight)
                    y1 = top + imgHeight - minHeight;
            }

            x2 = max(left, min(x2, left + imgWidth));
            y2 = max(top, min(y2, top + imgHeight));

            fixAspectRatio(abs(x2 - x1) < abs(y2 - y1) * aspectRatio);

            if (abs(x2 - x1) > maxWidth) {
                /* Selection width is greater than maxWidth */
                x2 = x1 - maxWidth * (x2 < x1 || -1);
                fixAspectRatio();
            }

            if (abs(y2 - y1) > maxHeight) {
                /* Selection height is greater than maxHeight */
                y2 = y1 - maxHeight * (y2 < y1 || -1);
                fixAspectRatio(true);
            }

            selection = { x1: selX(min(x1, x2)), x2: selX(max(x1, x2)),
                y1: selY(min(y1, y2)), y2: selY(max(y1, y2)),
                width: abs(x2 - x1), height: abs(y2 - y1) };

            update();

            options.onSelectChange(img, getSelection());
        }

        /**
         * Mousemove event handler triggered when the user is selecting an area
         *
         * @param event
         *            The event object
         * @return false
         */
        function selectingMouseMove(event) {
            x2 = /w|e|^$/.test(resize) || aspectRatio ? evX(event) : viewX(selection.x2);
            y2 = /n|s|^$/.test(resize) || aspectRatio ? evY(event) : viewY(selection.y2);

            doResize();

            return false;
        }

        /**
         * Move the selection area
         *
         * @param newX1
         *            New viewport X1
         * @param newY1
         *            New viewport Y1
         */
        function doMove(newX1, newY1) {
            x2 = (x1 = newX1) + selection.width;
            y2 = (y1 = newY1) + selection.height;

            $.extend(selection, { x1: selX(x1), y1: selY(y1), x2: selX(x2),
                y2: selY(y2) });

            update();

            options.onSelectChange(img, getSelection());
        }

        /**
         * Mousemove event handler triggered when the selection area is being moved
         *
         * @param event
         *            The event object
         * @return false
         */
        function movingMouseMove(event) {
            x1 = max(left, min(startX + evX(event), left + imgWidth - selection.width));
            y1 = max(top, min(startY + evY(event), top + imgHeight - selection.height));

            doMove(x1, y1);

            event.preventDefault();
            return false;
        }

        /**
         * Start selection
         */
        function startSelection() {
            $(document).unbind('mousemove', startSelection);
            adjust();

            x2 = x1;
            y2 = y1;
            doResize();

            resize = '';

            if (!$outer.is(':visible'))
            /* Show the plugin elements */
                $box.add($outer).hide().fadeIn(options.fadeSpeed || 0);

            shown = true;

            $(document).unbind('mouseup', cancelSelection)
                .mousemove(selectingMouseMove).one('mouseup', docMouseUp);
            $box.unbind('mousemove', areaMouseMove);

            options.onSelectStart(img, getSelection());
        }

        /**
         * Cancel selection
         */
        function cancelSelection() {
            $(document).unbind('mousemove', startSelection)
                .unbind('mouseup', cancelSelection);
            hide($box.add($outer));

            setSelection(selX(x1), selY(y1), selX(x1), selY(y1));

            /* If this is an API call, callback functions should not be triggered */
            if (!(this instanceof $.imgAreaSelect)) {
                options.onSelectChange(img, getSelection());
                options.onSelectEnd(img, getSelection());
            }
        }

        /**
         * Image mousedown event handler
         *
         * @param event
         *            The event object
         * @return false
         */
        function imgMouseDown(event) {
            /* Ignore the event if animation is in progress */
            if (event.which != 1 || $outer.is(':animated')) return false;

            adjust();
            startX = x1 = evX(event);
            startY = y1 = evY(event);

            /* Selection will start when the mouse is moved */
            $(document).mousemove(startSelection).mouseup(cancelSelection);

            return false;
        }

        /**
         * Window resize event handler
         */
        function windowResize() {
            doUpdate(false);
        }

        /**
         * Image load event handler. This is the final part of the initialization
         * process.
         */
        function imgLoad() {
            imgLoaded = true;

            /* Set options */
            setOptions(options = $.extend({
                classPrefix: 'imgareaselect',
                movable: true,
                parent: 'body',
                resizable: true,
                resizeMargin: 10,
                onInit: function () {
                },
                onSelectStart: function () {
                },
                onSelectChange: function () {
                },
                onSelectEnd: function () {
                }
            }, options));

            $box.add($outer).css({ visibility: '' });

            if (options.show) {
                shown = true;
                adjust();
                update();
                $box.add($outer).hide().fadeIn(options.fadeSpeed || 0);
            }

            /*
             * Call the onInit callback. The setTimeout() call is used to ensure
             * that the plugin has been fully initialized and the object instance is
             * available (so that it can be obtained in the callback).
             */
            setTimeout(function () {
                options.onInit(img, getSelection());
            }, 0);
        }

        /**
         * Document keypress event handler
         *
         * @param event
         *            The event object
         * @return false
         */
        var docKeyPress = function (event) {
            var k = options.keys, d, t, key = event.keyCode;

            d = !isNaN(k.alt) && (event.altKey || event.originalEvent.altKey) ? k.alt :
                    !isNaN(k.ctrl) && event.ctrlKey ? k.ctrl :
                    !isNaN(k.shift) && event.shiftKey ? k.shift :
                !isNaN(k.arrows) ? k.arrows : 10;

            if (k.arrows == 'resize' || (k.shift == 'resize' && event.shiftKey) ||
                (k.ctrl == 'resize' && event.ctrlKey) ||
                (k.alt == 'resize' && (event.altKey || event.originalEvent.altKey))) {
                /* Resize selection */

                switch (key) {
                    case 37:
                        /* Left */
                        d = -d;
                    case 39:
                        /* Right */
                        t = max(x1, x2);
                        x1 = min(x1, x2);
                        x2 = max(t + d, x1);
                        fixAspectRatio();
                        break;
                    case 38:
                        /* Up */
                        d = -d;
                    case 40:
                        /* Down */
                        t = max(y1, y2);
                        y1 = min(y1, y2);
                        y2 = max(t + d, y1);
                        fixAspectRatio(true);
                        break;
                    default:
                        return;
                }

                doResize();
            }
            else {
                /* Move selection */

                x1 = min(x1, x2);
                y1 = min(y1, y2);

                switch (key) {
                    case 37:
                        /* Left */
                        doMove(max(x1 - d, left), y1);
                        break;
                    case 38:
                        /* Up */
                        doMove(x1, max(y1 - d, top));
                        break;
                    case 39:
                        /* Right */
                        doMove(x1 + min(d, imgWidth - selX(x2)), y1);
                        break;
                    case 40:
                        /* Down */
                        doMove(x1, y1 + min(d, imgHeight - selY(y2)));
                        break;
                    default:
                        return;
                }
            }

            return false;
        };

        /**
         * Apply style options to plugin element (or multiple elements)
         *
         * @param $elem
         *            A jQuery object representing the element(s) to style
         * @param props
         *            An object that maps option names to corresponding CSS
         *            properties
         */
        function styleOptions($elem, props) {
            for (var option in props)
                if (options[option] !== undefined)
                    $elem.css(props[option], options[option]);
        }

        /**
         * Set plugin options
         *
         * @param newOptions
         *            The new options object
         */
        function setOptions(newOptions) {
            if (newOptions.parent)
                ($parent = $(newOptions.parent)).append($box.add($outer));

            /* Merge the new options with the existing ones */
            $.extend(options, newOptions);

            adjust();

            if (newOptions.handles != null) {
                /* Recreate selection area handles */
                $handles.remove();
                $handles = $([]);

                i = newOptions.handles ? newOptions.handles == 'corners' ? 4 : 8 : 0;

                while (i--)
                    $handles = $handles.add(div());

                /* Add a class to handles and set the CSS properties */
                $handles.addClass(options.classPrefix + '-handle').css({
                    position: 'absolute',
                    /*
                     * The font-size property needs to be set to zero, otherwise
                     * Internet Explorer makes the handles too large
                     */
                    fontSize: 0,
                    zIndex: zIndex + 1 || 1
                });

                /*
                 * If handle width/height has not been set with CSS rules, set the
                 * default 5px
                 */
                if (!parseInt($handles.css('width')) >= 0)
                    $handles.width(5).height(5);

                /*
                 * If the borderWidth option is in use, add a solid border to
                 * handles
                 */
                if (o = options.borderWidth)
                    $handles.css({ borderWidth: o, borderStyle: 'solid' });

                /* Apply other style options */
                styleOptions($handles, { borderColor1: 'border-color',
                    borderColor2: 'background-color',
                    borderOpacity: 'opacity' });
            }

            /* Calculate scale factors */
            scaleX = options.imageWidth / imgWidth || 1;
            scaleY = options.imageHeight / imgHeight || 1;

            /* Set selection */
            if (newOptions.x1 != null) {
                setSelection(newOptions.x1, newOptions.y1, newOptions.x2,
                    newOptions.y2);
                newOptions.show = !newOptions.hide;
            }

            if (newOptions.keys)
            /* Enable keyboard support */
                options.keys = $.extend({ shift: 1, ctrl: 'resize' },
                    newOptions.keys);

            /* Add classes to plugin elements */
            $outer.addClass(options.classPrefix + '-outer');
            $area.addClass(options.classPrefix + '-selection');
            for (i = 0; i++ < 4;)
                $($border[i - 1]).addClass(options.classPrefix + '-border' + i);

            /* Apply style options */
            styleOptions($area, { selectionColor: 'background-color',
                selectionOpacity: 'opacity' });
            styleOptions($border, { borderOpacity: 'opacity',
                borderWidth: 'border-width' });
            styleOptions($outer, { outerColor: 'background-color',
                outerOpacity: 'opacity' });
            if (o = options.borderColor1)
                $($border[0]).css({ borderStyle: 'solid', borderColor: o });
            if (o = options.borderColor2)
                $($border[1]).css({ borderStyle: 'dashed', borderColor: o });

            /* Append all the selection area elements to the container box */
            $box.append($area.add($border).add($areaOpera)).append($handles);

            if (msie) {
                if (o = ($outer.css('filter') || '').match(/opacity=(\d+)/))
                    $outer.css('opacity', o[1] / 100);
                if (o = ($border.css('filter') || '').match(/opacity=(\d+)/))
                    $border.css('opacity', o[1] / 100);
            }

            if (newOptions.hide)
                hide($box.add($outer));
            else if (newOptions.show && imgLoaded) {
                shown = true;
                $box.add($outer).fadeIn(options.fadeSpeed || 0);
                doUpdate();
            }

            /* Calculate the aspect ratio factor */
            aspectRatio = (d = (options.aspectRatio || '').split(/:/))[0] / d[1];

            $img.add($outer).unbind('mousedown', imgMouseDown);

            if (options.disable || options.enable === false) {
                /* Disable the plugin */
                $box.unbind('mousemove', areaMouseMove).unbind('mousedown', areaMouseDown);
                $(window).unbind('resize', windowResize);
            }
            else {
                if (options.enable || options.disable === false) {
                    /* Enable the plugin */
                    if (options.resizable || options.movable)
                        $box.mousemove(areaMouseMove).mousedown(areaMouseDown);

                    $(window).resize(windowResize);
                }

                if (!options.persistent)
                    $img.add($outer).mousedown(imgMouseDown);
            }

            options.enable = options.disable = undefined;
        }

        /**
         * Remove plugin completely
         */
        this.remove = function () {
            /*
             * Call setOptions with { disable: true } to unbind the event handlers
             */
            setOptions({ disable: true });
            $box.add($outer).remove();
        };

        /*
         * Public API
         */

        /**
         * Get current options
         *
         * @return An object containing the set of options currently in use
         */
        this.getOptions = function () {
            return options;
        };

        /**
         * Set plugin options
         *
         * @param newOptions
         *            The new options object
         */
        this.setOptions = setOptions;

        /**
         * Get the current selection
         *
         * @param noScale
         *            If set to <code>true</code>, scaling is not applied to the
         *            returned selection
         * @return Selection object
         */
        this.getSelection = getSelection;

        /**
         * Set the current selection
         *
         * @param x1
         *            X coordinate of the upper left corner of the selection area
         * @param y1
         *            Y coordinate of the upper left corner of the selection area
         * @param x2
         *            X coordinate of the lower right corner of the selection area
         * @param y2
         *            Y coordinate of the lower right corner of the selection area
         * @param noScale
         *            If set to <code>true</code>, scaling is not applied to the
         *            new selection
         */
        this.setSelection = setSelection;

        /**
         * Cancel selection
         */
        this.cancelSelection = cancelSelection;

        /**
         * Update plugin elements
         *
         * @param resetKeyPress
         *            If set to <code>false</code>, this instance's keypress
         *            event handler is not activated
         */
        this.update = doUpdate;

        /* Do the dreaded browser detection */
        var msie = (/msie ([\w.]+)/i.exec(ua) || [])[1],
            opera = /opera/i.test(ua),
            safari = /webkit/i.test(ua) && !/chrome/i.test(ua);

        /*
         * Traverse the image's parent elements (up to <body>) and find the
         * highest z-index
         */
        $p = $img;

        while ($p.length) {
            zIndex = max(zIndex,
                !isNaN($p.css('z-index')) ? $p.css('z-index') : zIndex);
            /* Also check if any of the ancestor elements has fixed position */
            if ($p.css('position') == 'fixed')
                position = 'fixed';

            $p = $p.parent(':not(body)');
        }

        /*
         * If z-index is given as an option, it overrides the one found by the
         * above loop
         */
        zIndex = options.zIndex || zIndex;

        if (msie)
            $img.attr('unselectable', 'on');

        /*
         * In MSIE and WebKit, we need to use the keydown event instead of keypress
         */
        $.imgAreaSelect.keyPress = msie || safari ? 'keydown' : 'keypress';

        /*
         * There is a bug affecting the CSS cursor property in Opera (observed in
         * versions up to 10.00) that prevents the cursor from being updated unless
         * the mouse leaves and enters the element again. To trigger the mouseover
         * event, we're adding an additional div to $box and we're going to toggle
         * it when mouse moves inside the selection area.
         */
        if (opera)
            $areaOpera = div().css({ width: '100%', height: '100%',
                position: 'absolute', zIndex: zIndex + 2 || 2 });

        /*
         * We initially set visibility to "hidden" as a workaround for a weird
         * behaviour observed in Google Chrome 1.0.154.53 (on Windows XP). Normally
         * we would just set display to "none", but, for some reason, if we do so
         * then Chrome refuses to later display the element with .show() or
         * .fadeIn().
         */
        $box.add($outer).css({ visibility: 'hidden', position: position,
            overflow: 'hidden', zIndex: zIndex || '0' });
        $box.css({ zIndex: zIndex + 2 || 2 });
        $area.add($border).css({ position: 'absolute', fontSize: 0 });

        /*
         * If the image has been fully loaded, or if it is not really an image (eg.
         * a div), call imgLoad() immediately; otherwise, bind it to be called once
         * on image load event.
         */
        img.complete || img.readyState == 'complete' || !$img.is('img') ?
            imgLoad() : $img.one('load', imgLoad);

        /*
         * MSIE 9.0 doesn't always fire the image load event -- resetting the src
         * attribute seems to trigger it. The check is for version 7 and above to
         * accommodate for MSIE 9 running in compatibility mode.
         */
        if (!imgLoaded && msie && msie >= 7)
            img.src = img.src;
    };

    /**
     * Invoke imgAreaSelect on a jQuery object containing the image(s)
     *
     * @param options
     *            Options object
     * @return The jQuery object or a reference to imgAreaSelect instance (if the
     *         <code>instance</code> option was specified)
     */
    $.fn.imgAreaSelect = function (options) {
        options = options || {};

        this.each(function () {
            /* Is there already an imgAreaSelect instance bound to this element? */
            if ($(this).data('imgAreaSelect')) {
                /* Yes there is -- is it supposed to be removed? */
                if (options.remove) {
                    /* Remove the plugin */
                    $(this).data('imgAreaSelect').remove();
                    $(this).removeData('imgAreaSelect');
                }
                else
                /* Reset options */
                    $(this).data('imgAreaSelect').setOptions(options);
            }
            else if (!options.remove) {
                /* No exising instance -- create a new one */

                /*
                 * If neither the "enable" nor the "disable" option is present, add
                 * "enable" as the default
                 */
                if (options.enable === undefined && options.disable === undefined)
                    options.enable = true;

                $(this).data('imgAreaSelect', new $.imgAreaSelect(this, options));
            }
        });

        if (options.instance)
        /*
         * Return the imgAreaSelect instance bound to the first element in the
         * set
         */
            return $(this).data('imgAreaSelect');

        return this;
    };

})(jQuery);
